James Callis is an English actor. His acting career started in the mid 1990s. His first significant role was on the TV series Soldier Soldier. In the 2000s, he starred on the TV movies Jason and the Argonauts and Arabian Nights. He then played the role of Tom in Bridget Jones’s Diary and its sequel Bridget Jones: The Edge of Reason. On television, he became widely known for his role as Dr. Gaius Baltar on Battlestar Galactica. He next played Dr. Trevor Grant on Eureka. He’s recently appeared on the miniseries A.D. The Bible Continues and Gallipoli. He’s also recently played as recurring role The Witness on 12 Monkeys.